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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '612bf268ac867cc085e4fe835281a7e27df545daa78786e6733737c7f4e202e2' 
  AND token = 'ufhwSJIKC1JHIDm9sebmbPspu2Sz084yuQczIY1xuEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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