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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '58c5776f259160af2148bee8986fb718eca50539aedcc9db535f3f0a2f4b444f' 
  AND token = 'T6cnD0X7ntkEjwx/MrcR2fixetp+9yruj7VwkKdOmvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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