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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '965bf5e2056c87ec8d82ffac011af2ca2feaf56f0f136fb523697e00f386dc1e' 
  AND token = 'p1fOEMHM9axxdNYb1HJVjd0UEhMIaR2pyCPuRDe1/js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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