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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'afbac4b9b5d95836b18aafab860b4ddbef524ddd52ab58d4303b01a33e61c476' 
  AND token = 'E1Wedd6zf59fs5WtZwrR3M53sjJVOKUie9VmDnaqE30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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