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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e1950dc9e0aa00d5f4b1ee41642cad136d47c87c4b0e473b5f6f336eb20d21b1' 
  AND token = 'iwOpQv3j7rk3A4MA2J8fBENsAF1OCCC1JGsTrQ+NqCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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