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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'de7dd77054cd3a4e8a31ed10de2bc45c14206b633489a66d3cf0940fd18d4008' 
  AND token = 'FmVrwnGsFNl85nmWqL7zS/frOwRV6zgxqcMtVc7IMWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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