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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3b4bfed8797a74758a8255a5624e39cb75e8c5f2f1f067ddcf55c3a1738fe309' 
  AND token = 'jZM6sUgmBcjDpkiek4FmyBUDFTBpPLClDsAzdRQW8c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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