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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2e603c3133acc399afe80f2838b8c892c2d5391af852757aca1aa6f457c788cb' 
  AND token = 'cYcEa4HX4y8/6nJkIJ1g+Kx4VjoRgLEIIAvPMAhJ2ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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