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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3f9cd637b19950e16c7e6bd2e2b36c1773c59721843988035675d2932393dd0a' 
  AND token = 'pJe0TeySiw4Nn2pXlCu9ZxhIkNPNemXxPJUnNdax058=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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