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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a992e21b104dd10fc18bb429108e7a8e9c7621bd81420a184a69700db544b5e6' 
  AND token = '9a8lYwmOMIPGOHFBueZ/KF9fiVYDew2hospQuR2m4z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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