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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e90416977df20803a34a7e1da37819b38600c48dbc382fe2c04434fc63b34190' 
  AND token = '/5yzBkTrFHEcFlM4xPiMaNLDk9GhFxtYo2m4CU/uJsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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