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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '77edee19bb535d3a7de5b96d9e2eb0088f496680e4311b01bff7d57b8ffedd2c' 
  AND token = 'G+whvT4ShdC4HXBCjTfebaMsmCOffebPNbzJoCelknk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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