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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '05ce3a65bbb586916af374aefa130e7e9005972f79c8e5bbd389e1efbdda9fed' 
  AND token = 'bJBp3XYOOooC+8zYBcdUa60A/gxV3LRnToqJIEBS1eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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