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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fb6e259bd0610f639127988afbdd474f468509effc5a3c39ae56cb2201da38cf' 
  AND token = '/0pVu4aIkIaBNnWU9Ag8CG2vnnlWc2WSt9CQr7ddpic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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