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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '04f9cb19cbbf48cdd1af866dc176b14f437ab6258975d77055455a3cc4589f1a' 
  AND token = 'iDeV1+NmtclqYVu4MK01e/xs2LPy96P6lZyfQsDrF7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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