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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e5e8685ea8c29562e23f5858b842a13b4d42db5f0f3ad526ef2bb0c2b290092b' 
  AND token = 'vQKbRpHglsvcDBPK4SwZZyk1nVpgzCf19KnMEcJP2M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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