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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cfe026ce65652f04e7d7ecee22febf0a2032b564291b752f4074a00216a11d69' 
  AND token = '29wYflk3v06ugDqKId9IyFv4XrBcteolnCMJ4GDnU9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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