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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '94bf917e5cfbebfd33ea843268d321a56a64d645558565852693f185df0f5b5b' 
  AND token = 'OjzG3b3GSRlBszkfUyctwLtbFcn23PeHKSuP246c1TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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