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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a18ebed65c2c1cd3ea05e091a0ea20485e701fed972dfb146f07f8e0fc73fbba' 
  AND token = 'esip1vhQGeCZLzZkPF99D3X9Iw8bHXB5bUV9Slg3o3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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