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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5263fc926e2e760aa3914c5375b0adce6cef94feb77fead953a8cee25228db9c' 
  AND token = 'Jc1o+6gCuI/d0zqhSfDJtJOQOhx6HVIS85lgmP3RA7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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