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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '30d931e98765c3fa2d1ac01d2777f4f9a9afa008800145b3395788f9ecae3181' 
  AND token = 'MMVN/1sPbWPSAiCUfbpVXIxkZijZb3OPr/M39qJy3Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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