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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e9d1242032a9fdc51c6c37c20b2b485ebdc33c75846919efd545de653f52b25b' 
  AND token = 'RTcp0z6sR1syOPXOzhJ0bpk7x55hg4+f8+xHACojfEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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