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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6348ce92901522ea61edbc6da656e3307180b91f34d94b2aa0eae35be1059d43' 
  AND token = '0W+0ZgL2CCaSZ1hb6zv+l2Ij41k7jd+7rWX4vUbrC7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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