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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5fe23578c5a2750b3b748e9211c30262cb8766b4821b0cd34ca58bdcc21fa656' 
  AND token = 'ZchGuR2IO++lwuEPQhPhemEqoaAfDHwAhhreLrBla1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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