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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a8bcc233663e8bdff9f0cc619dac96b57a0d7d691bae710e4ed35d6b0733d5e5' 
  AND token = 'yzyoH9pvjpLqsuV/dWKcsJ2i2hYaLE2cMzpeoAKWeGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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