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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e33f52f6c324b17ee0e3f2fbe5e6832e3d8e68929d625818ed9bd43b3af9cd58' 
  AND token = 'm7HVDc9fSiHuXMaFzJXVxAjb/DwodaEvT29W6rCQ2hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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