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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '12da33352d8bffb8fad222b4be886e426387dd6b136d93dc5529c462cdd6dc49' 
  AND token = '+hAyZhEilBRri+/biDVKYcGimtnVq5yF6RFcK76vC5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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