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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '55bef8440b3000b637afca492c40c02a9016fddf3efca148749e5c3260adea4f' 
  AND token = 'pl1Qd99Tgo53FwyGOdeVFv629vRey8i8ieM19w7jWw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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