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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'af5110de979b5cd575cfa91ad4f385fe1f404bcdb8463ae62eac51c20c9bdbb3' 
  AND token = 'buASXyqyNtjBUyeMdpO89K2CX5PhgDu2338YNyHD1dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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