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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '735cae63640df3f7946639da9ef3cd7c735b35d1a03a9b93853bc8ec922c6598' 
  AND token = 'IUv9/mtAaiS2QW9jx9vYmrg/mXs2kM9cmTW90a4ird4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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