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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd2c51fc3178437ee289f6d23bb081d46663cfe4a59841640b3d9b0614fb04a59' 
  AND token = 'TLeDia5hA6d9oYaoCx/IVy+/D93K17IDnxkiq1ZmmpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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