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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9d868c29ada1e8f972ffae9b2afb71f3c9c71f83e412692d85a87095691314cc' 
  AND token = 'JWZE3Q6OkGHVL4Sz5Ue2lE471Eqxm6djXIU763Oh4Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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