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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2e5f3e2f729fcacecdc8842abbd1ed64994284b170b45773e038a0904b590459' 
  AND token = '5LMyQm0X42f5OV2VPrNuidezW4JeY3JXF5T5oR/Sdi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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