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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2d437d330b1d54366aae7a3b2d180c5f54c921f7d4c2ec2c4edc572af8cbb68d' 
  AND token = 'BehCS3pVn7qYJPdTFJ7T5kDaOPqtY6au9bg+7g4PwgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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