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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8ddafc448e61ea4c5a96abf42ce437cf5b2366a90e0e4f6874ea51ad5ce564bc' 
  AND token = '4o3I0guXGk7sq+95da7/t1grjBiValisNY3X4U0l+s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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