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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7439f57d6940cd82389c16fb5fcaaad2c33f655f82b8671e3f2505a4d98741ba' 
  AND token = 'HmxRrR3eNKJ/ELI9V0KG6r1VGC87sxt83kavkNrQt5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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