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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1eada429bbdce44386fdba860c3d753ec2ab6f0b049158060edd651432e92c12' 
  AND token = 'IE0ISJRx3hPJStQsqvpsegpHWkCWRYNJut5p8dobGYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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