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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '725fb4a5367b46f8e0e1a8f7287f0de0cc1f9387195c70a90bf1f6830e7a4749' 
  AND token = 'NtLgB7uJe6qb8C6/2IDAy/xcGB5WFEkFWM6AF0d3eRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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