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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f618a5d1ce09c7d16da312300715233c1f83228596f857c371e5dd59ac2faffa' 
  AND token = 'Vi4Hr0fN5hxddS/OqPW8f98GSYiRz3BJKec/Ct4kit4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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