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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bdc717a27536db2f16e94c1a4e87f35f3ce0c88f86ba18e97adbfd6be1a36df2' 
  AND token = 'CSePzinW5Q9zPf1KpbiKNxYwmshOMu8i7HXhHfuuyx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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