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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1e56589cd19476e473374126469721d68c93f7dc362db45ccc968aca8ecbcb65' 
  AND token = '3U7YVcu3821i222Uf8HvuknXoZULxO+itQU9JlfB7wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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