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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fcf098ffa61c10e3198814a3ef24f6077ae9443bdcd78ae0109373a3473f7562' 
  AND token = 'm3qOm8VAiIihlfa1e+Uh57hTetbWztlVl7cPX2cKDN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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