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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c4d9f3f37e0b2287d6cde2f30e589d9d0e92c31bf76a716ad51fc68190a0705e' 
  AND token = 'bbKl2IlHJ8HE+TkwZGNHyAvq4TRDAqbRZEGaJ1szTT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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