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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f31885435e8042156859312a59f9ada69af8789a133e81e62168f7148601dea8' 
  AND token = '3Il1OmtaqQl8rVSqGPame9QPSxdAWbSZF6hm0ucNUgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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