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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '364e8c2d7485b10155d336a5bd17b4a203d87551b1b66176b15e1d38f9908dc7' 
  AND token = '0SKL3Rn5OoEdq3AH/pGS3RiqyvwLVyCFH5XUFFtFbHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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