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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e5336ea1a68bb3d04e37d540c9d7ea56464dea2d16c1ae7560896af2689177b1' 
  AND token = 'OllipoF6Pp+RBBRrih8dxHemF/ecYgKVgrOi/UNdVng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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