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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '85015d41861233fdc9f7dc492934069472f82c7d8e72be36c0748473ffcabd07' 
  AND token = 'qH2YsWbyAfbS6slG5Qu8/t8deoFOd8F7KHmMTmdeOUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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