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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '01b8189195778e845740b5eb541b080e6a04b08cbe3562b97589d94e0135401c' 
  AND token = '/nE8VhwygngwShrWFOp2Ituq2yj0pcZlDrFUqT7nkug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}