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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5b19ede600eacfc9c0bffa83ec2920fb872c67e5f62a85d2616b07d82b792363' 
  AND token = '4En5L73gOnolv5O0Lof48SNloglV7vP8Xb6cHrytzR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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