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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9ef88fea8b8636ba7cfe116e3ebb1d682e2e1e319765c5b6b550adad3dfa3d59' 
  AND token = 'J+3n93wfYF3NV/RiY3HcHZ+HduKUolUc/RZiJZI1+U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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