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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '921b2ca77d492c9f13e39a966ba4343f84a881f26416e720f0142073600c1dc4' 
  AND token = 'uADGT8Q/gFGajEG11sSiuWn9v2czUNPFM89esuA5E7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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