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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '31561695114199eb4132e90fdcf168beeaf8fa7874ba2c75f942155913dca163' 
  AND token = 'BOgWJ8syOj5JSjk5whvxhEAZCnZggaB15Engn+mE4ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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