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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4c779c692605e3969c1ff51054cc831e7f127f0f006788cfef9dda7a31557b8b' 
  AND token = '8z71LtWFVUGSWssFSX71s0czxKiTSJmVnBiZ1tBL0zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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